of no/little importance not important, or not very important. These phrases sound a little more formal than unimportant 不/不太重要〔该短语比unimportant稍显正式〕
If you're capable of doing the job, your age is of no importance.
只要能胜任这个工作,年龄无关紧要。
It's of little importance whether or not this story is true.
该说法是否属实并不重要。
minor small and not very likely to have an important effect – used especially about changes, problems, injuries, damage, or differences 〔尤指变化、问题、伤害、损失或区别〕小的,无关紧要的